What does this mean.
Frost on roof means.
And here s the clincher.
Is a lack of frost a good sign or bad sign.
What does a lack of frost on my roof mean.
Some people have wondered about that sharp dividing line between the frosty roof over the garage and the not so frosty roof over the living space.
When warm air from inside the house escapes traveling up through the bypasses the moisture condenses on the roof boards and rafters where the frost can form.
A well insulated attic floor will keep the heat in the home better making the roof thaw evenly.
A note about the sharp dividing line.
When the outside temperature rises again the frost thaws water collects and can leak into your house.
Roofcorp explores what frost on a roof or lack thereof means for your home and roofing system.
During winter conditions attic frost is a problem associated with attic bypasses.
The overhang porch and garage keep ice on them longer.
Homes that let heat escape more rapidly than others will keep ice on the overhangs but not over the living area.
2 the car roof cools radiatively.
Something i implied above but didn t say explicitly is that when frost forms on the roof the roof is below freezing.
In other words the sequence might be as follows.
1 initially the air and the car are at temperature 37 f and the dew point is 35.
As it cools below 35 degrees water condenses on it.